{{Short description|Species of snake}} {{Speciesbox |image = Trimeresurus hageni 2002 Indonesia stamp.jpg | status = LC | status_system = IUCN3.1 | status_ref = <ref name="iucn status 20 November 2021">{{cite iucn |author=Grismer, L. |author-link=species:Larry Lee Grismer |author2=Chan-Ard, T. |author2-link=species:Tanya Chan-ard |date=2012 |title=''Trimeresurus hageni '' |volume=2012 |article-number=e.T191906A2013598 |doi=10.2305/IUCN.UK.2012-1.RLTS.T191906A2013598.en |access-date=20 November 2021}}</ref> |genus = Trimeresurus |species = hageni |authority = ([[Theodorus Willem van Lidth de Jeude|Lidth de Jeude]], 1886) |synonyms = *''Bothrops Hageni'' <br />{{small|Lidth de Jeude, 1886}} *''Lachesis sumatranus'' (part)<br />{{small|— [[George Albert Boulenger|Boulenger]], 1896}} *''Trimeresurus hageni'' <br />{{small|— [[Leo Brongersma|Brongersma]], 1933}}<ref name="McD99">[[species:Roy Wallace McDiarmid|McDiarmid RW]], [[Jonathan A. Campbell|Campbell JA]], [[species:T'Shaka A. Touré|Touré TA]] (1999). ''Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1''. Washington, District of Columbia: Herpetologists' League. 511 pp. {{ISBN|1-893777-00-6}} (series). {{ISBN|1-893777-01-4}} (volume).</ref> *''Parias hageni'' <br />{{small|— [[species:Anita Malhotra|Malhotra]] & [[species:Roger S. Thorpe|Thorpe]], 2004}} *''Trimeresurus (Parias) hageni'' <br />{{small|— [[species:Patrick David|David]] et al., 2011}} | synonyms_ref = <ref name=RDB>{{EMBL species|genus=Trimeresurus|species=hageni}} www.reptile-database.org.</ref> }}

'''''Trimeresurus hageni''''', [[Common name|commonly known]] as '''Hagen's pit viper'''<ref name=Gum04>[[species:Andreas Gumprecht|Gumprecht A]], [[species:Frank Tillack|Tillack F]], [[species:Nikolai Liutsianovich Orlov|Orlov NL]], [[Ashok Captain|Captain A]], [[species:Sergei Eleksandrovich Ryabov|Ryabov S]] (2004). ''Asian Pit vipers''. Berlin: GeitjeBooks. 1st Edition. 368 pp. {{ISBN|3-937975-00-4}}.</ref> and '''Hagen's green pit viper''',<ref name="iucn status 20 November 2021" /> is a [[species]] of [[venomous snake]] in the [[subfamily]] [[Pit viper|Crotalinae]] of the [[Family (taxonomy)|family]] [[Viperidae]]. The species is native to [[Southeast Asia]]. There are no [[subspecies]] that are recognized as being valid.<ref name=ITIS>{{ITIS|id=634916|taxon=''Trimeresurus hageni ''|accessdate=28 July 2008}}</ref>

==Etymology== The [[Specific name (zoology)|specific name]], ''hageni'', is in honor of German [[naturalist]] Dr. [[:de:Bernhard Hagen (Ethnologe)|Bernhard Hagen]], who collected [[mammal]]s, [[bird]]s, [[reptile]]s, and [[insect]]s in the eastern part of Sumatra.<ref>[[Fredericus Anna Jentink|Jentink FA]] (1888). "On a Collection of Mammals from East-Sumatra". ''Notes from the Leyden Museum'' '''11''' (6):17–30.</ref><ref>[[species:Bo Beolens|Beolens, Bo]]; [[species:Michael Watkins|Watkins, Michael]]; Grayson, Michael (2011). ''The Eponym Dictionary of Reptiles''. Baltimore: Johns Hopkins University Press. xiii + 296 pp. {{ISBN|978-1-4214-0135-5}}. (''Trimeresurus hageni'', p. 113).</ref>

==Description== [[File:Trimeresurus hageni, Hagen's pit viper (male) - Bang Lang National Park (50217234436).jpg|thumb|right|Specimen in Bang Lang National Park.]] Scalation of ''T. hageni'' includes 21 rows of [[dorsal scales]] at midbody, 176–198 [[ventral scales]], 63–89 [[subcaudal scales]], and 9–12 [[supralabial scales]].<ref name=Gum04/> The [[Type (biology)|lectotype]] has a total length (including tail) of {{cvt|97|cm|in}}.<ref name=RDB/>

==Geographic range== ''T. hageni'' is found in [[Southern Thailand|Peninsular Thailand]], [[Peninsular Malaysia]], [[East Malaysia]] ([[Borneo]]), and [[Indonesia]] ([[Sumatra]] and the nearby islands of [[Bangka Island|Bangka]], Simalur, [[Nias]], [[Batu Islands|Batu]], and the [[Mentawai Islands]]).

The [[Type locality (biology)|type locality]] given is "Sumatra ... [and] island of Banka". [[Leo Brongersma|Brongersma]] (1933) emended this to "Deli, Sumatra".<ref name="McD99"/>

==Habitat== The preferred natural [[habitat]] of ''T. hageni'' is [[forest]], at altitudes of {{cvt|100|–|300|m|ft}}.<ref name="iucn status 20 November 2021"/>

==Behavior== ''T. hageni'' is [[Arboreal locomotion|arboreal]] and [[Nocturnality|nocturnal]].<ref name="iucn status 20 November 2021"/>

==Diet== ''T. hageni'' [[Predation|preys]] upon [[amphibian]]s and [[lizard]]s.<ref name="iucn status 20 November 2021"/>

==Reproduction== ''T. hageni'' is [[Oviparity|oviparous]].<ref name=RDB/>

==References== {{Reflist}}

==Further reading== *[[Leo Brongersma|Brongersma LD]] (1933). "Herpetological Notes I-IX". ''Zoologische Mededeelingen'' (Leiden) '''16''': 1-29. (''Trimeresurus hageni'', new combination). *[[species:Indraneil Das|Das I]] (2012). ''A Naturalist's Guide to the Snakes of South-East Asia: Malaysia, Singapore, Thailand, Myanmar, Borneo, Sumatra, Java and Bali''. Oxford, England: John Beaufoy Publishing. 176 pp. {{ISBN|978-1906780708}}. *[[Theodorus Willem van Lidth de Jeude|Lidth de Jeude, Th. W. van]] (1886). "On ''Cophias Wagleri'' Boie and ''Coluber sumatranus'' Raffles". ''Notes from the Leyden Museum'' '''8''' (10): 43–54. (''"Bothrops Hageni"'', new species, pp.&nbsp;53–54). *[[species:Kate Laura Sanders|Sanders KL]], [[species:Anita Malhotra|Malhotra A]], [[species:Roger S. Thorpe|Thorpe RS]] (2002). "A contribution to the systematics of two commonly confused pitvipers from the Sunda Region: ''Trimeresurus hageni'' and ''T. sumatranus'' ". ''Bulletin of the Natural History Museum London (Zoology Series)'' '''68''' (2): 107–111.

{{Taxonbar|from=Q3011465}}

[[Category:Reptiles described in 1886]] [[Category:Reptiles of Southeast Asia]] [[Category:Trimeresurus|hageni]] [[Category:Reptiles of Borneo]]

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